Spray-pump for explosive-engines.



J. T. METCALFE.

SPRAY PUMP FOR EXPLOSIVE ENGINES.

Patented May 277, I902.

(Application filed Aug. 7, 1901.)

2 Sheets-Sheet I.

(no Model.)

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Patnted May 27, I902.

.4. T; METCALFE. SPRAY PUMP FOR EXPLOSIVE ENGINES.

(Application filed Aug. 7, 1901.)

2 Sheets-Sheet 2.

(No Model.)

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Ni'rnn STATES PATET FFICE.

7 JOHN TITUS METCALFE, OF QUINCY, PENNSYLVANIA.

SPRAY-PUMP FOR EXPLOSlVE-ENGINES.

SPECIFICATION forming part of Letters Patent No. 701,069, dated May 27, 1902.

Application filed August '7, 1901. Serial N|71;188- (No model.)

To all whom, it may concern.-

Be itknown that 1, JOHN TITUS METCALFE, a citizen of the United States, and a resident of Quincy,in the county of Franklin and State of Pennsylvania, have invented a new and Improved Spray-Pump for Explosive-Engines, of which the following is a full, clear, and exact description.

My invention relates to explosive-engines, such as gas and gasolene engines, in which successive charges of liquid hydrocarbon are first vaporized and mixed with air and then caused to explode.

The particular objects of my present invention are to make a suitable pump and appropriate connections for use in mechanism of this kind and also to cushion the rebound of the valve used to prevent the retrogression of gases from the cylinder after each explosion.

The invention consists of novel features and parts and combinations of the same, as will be fully described hereinafter and then pointed out in the claim.

A practical embodiment of the invention is represented in the accompanying drawings, forming a part of this specification, in which similar characters of reference indicate corresponding'parts in all the views.

Figurel is an elevation of the cylinder of a gasolene-engine, showing in section my device as appliedthereto. Fig. 1 is a detail view showing means for supplying thehydrocarbon liquidto the engine. Fig.2 is a sectional view on the line 2 2 in Fig. 1 viewed in the'direction of the arrow; and Fig. 3 is a horizontal section on the line.3.3 in Fig. 1, showing certain parts in relief.

Attached to the cylinder 1 by a bracket 2 is a casing 3, which incloses the parts and which also serves tosupport a pump 20.

4 is a plate or cap for closing the casing and secured thereto by means of bolts 5 and 6. Bolts 7, 8, 9, and 10 pass through the easing into the bracket 2 for the purpose of supporting the casing. A valve 11 is mounted upon a stem'12 and is normally pressed downward by a spring 13, the tension of which is sustained by the piston and a nut 14. The piston 14 and the spring 13 are inclosed in a tube 15, having an air-hole 15, this tube being secured by means of a screw-bolt 18 to the framework. By means of this bolt 18 the tube may be adjusted up or down, and thereby the space 16 in the lower end of the tube may be governed at will. The tube acts as a dash-pot or vacuum-chest. When the valve -stem moves upward, air in the space 16 is drawn in to some extent rapidly through the air-hole 15,1thus cushioning the movement of the valve in that direction. Within the casing a passage 9 leads to the explosive-cylinder, which forms no part of the present invention, but is described in an independent application filed by me on the th day of July, 1901', Serial No. 69,712.

Adjacent to the passage 9 and normally communicating therewith is another passage or open space 16, which is supplied with air by means of air-tubes 17, secured within the casing by means of threads 19. This space 16 is the vaporizing chamber or space where the hydrocarbon liquid is caused to volatilize and to mix with air, so as to be in condition for producing explosions. This volatilizingchamber 16 is separated from the chamber 9 by the valve 11, the aperture between the two chambers being opened when the engine cylinder piston moves out and takes in through the valve 11 and through the aperture 9 the mixture of gas from the vaporizingchamber 16, and on the return of said piston the valve 11 closes down and the gases are compressed in the explosion-chamber ready to be fired. After the explosion the piston moves out again and by its suction lifts the valve 11 again and takes in another charge, as above stated.

The small piston 14 on the lower end of the valve-stem 12 is fitted neatly in the closed tube 15 and is adjusted and secured by the nut 14. This small piston and the closed tube cause a-va'cuum on the lift of the valve lland prevent the valve from clattering or hammering when the suction of the enginepiston on its outward movements draws in the gas through the valve 11 into the explosion-chamber through the passage 9.

The pump 20 comprises a cylindrical cup 21, fitted with an annular gland 22 and a packing 23, these parts constituting an effective stufling-box inclosing a plunger 24, which has a longitudinal movement through the stuffing-box. The lower end of the plunger 24 is provided with a valve-stem 33 and a conical valve 34, the object of which is to close the passage 35 when the plunger is in its uppermost position, as shown in Fig. 1. At 36 is a small chamber closed by a screw 37, which is integral with the nut 49. From the chamber 36 there projects a small nozzle 38, through which the hydrocarbon liquid is projected from the pump. The liquid is forced through this nozzle by the plunger 24, which of course fits fluid-tight in the stuffing-box. When the plunger is raised, a suction is produced, which draws the hydrocarbon liquid through the inlet-pipe'27 and raises the valve 28. Upon the descent of the plunger the liquid is forced out through the pipe 38 into the volatilizing-chamber 16, where it mixes with air coming up through the pipe 17, and thence passes around the normally open valve through the passage 9 and into the explosion-chamber of the cylinder.

The pipe 27 is provided with an elbow 50, which is connected to the vertical pipe 51, leading downward from the hydrocarbon stand-pipe 52. The liquid 53 is conveyed into this tank through the inlet-pipe 54 by any convenient means, such as a pump. An overflow is furnished by the exit-pipe 55 for keeping the liquid in the tank at a constant height and under uniform pressure.

In consequence of the elevation of the stand-pipe and consequent pressure of the liquid the spray-pump needs only one valve, the tendency of the liquid to enter the pump being so great as to prevent the pipe 38 from sucking in air. By the omission of an exitvalve the spray is comparatively free and unobstructed.

The frame 30 of the pump is secured by means of the bolt 32 to the framework 31 and is provided with a bolt 29, whereby access is had to the valve 28. The plunger 24 is provided at its top with a plate 25, secured in place by a nut 26. Through this plate loosely project two stationary guides 48, which are provided with springs 46 for the purpose of normally pressing said plate upward, and thereby raising the plunger. The normal position, therefore, of the plunger 24 and all the parts rigidly secured to the same is as shown in Fig. 2.

Upon a shaft 44 is secured a rotary cam 45, which engages a roller 43 upon a lever 42, which is pivoted upon the framework at 41, so that the movement of the cam causes the lever to oscillate. One end of the lever is provided with a head 39, through which passes a screw-bolt 40 for the purpose of adjusting the stroke of the pump. When the bolt 40 is turned in one direction and thereby raised,

the lower end of the bolt 40 is raised relatively to the end of the bolt 47, extending from the plunger 24, so that the movement of the lever 42 has comparatively little effect in depressing the plunger 24. When the screw-bolt 40 is moved downward a sufficient distance, the plunger 24 can be given a maximum stroke, the length of which is determined by the cam 45.

The operation of my device is as follows: Hydrocarbon liquid being supplied to the pipe 27, the pump is operated, as above described, and the liquid is vaporized in the vaporizing-chamber 16 and is periodically drawn into the explosion-chamber. By adjusting the bolt 40, and thereby regulating the stroke of the plunger 24, any desired volume of liquid can be injected into the volatilizingchamber 16 at each stroke of the plunger. All that is necessary, therefore, to govern the proper mixture of gas is to adjust the screw-bolt 40, and thereby regulate the volume of hydrocarbon liquid injected into the vaporizing-chamber. The several successive charges of hydrocarbon liquid are scattered by the nozzle into the chamber in the form of a fine spray, like that from any small hose, and vaporization is therefore greatly facilitated.

Having thus fully described my invention, I claim as new and desire to secure by Letters Patent A spray-pump for explosive-engines, comprising a hollow passage leading to the explosion-chamber, a pair of receptacles disposed adjacent to said passage and connected together by a neck, a piston fitting oil-tight into one of said receptacles and provided with a valvestem, said valve-stem projecting loosely through said neck into the other receptacle, a valve mounted upon said valvestem within said other receptacle, a tube connected with said receptacle containing said valve and with said passage leading to the explosion-chamber, said tube being disposed obliquely upward to prevent entry of airbubbles into said receptacles, a lever for pe riodically depressing said piston, a cam for. actuating said lever, a check-valve for preventing retrogression of the hydrocarbon liquid from said receptacles, and an elevated tank for supplying said liquid under constant pressure to said receptacles.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

JOHN TITUS METOALFE.

Witnesses:

J. D. GIFT, A. .T. MILLER. 

